How many comments in Apex classes / triggers? (Execute anon script)

gistfile1.txt

/* Taken from: http://www.johnwestenhaver.com/2015/03/how-much-of-your-apex-is-comments.html
   I am unsure why string method .replaceAll is needed but I assume it is because the .trim method doesn't remove white 
   space at the start of a line. 
   http://www.salesforce.com/us/developer/docs/dbcom_apex250/Content/apex_methods_system_string.htm
   This is an execute anon script */

Integer classLines = 0;
Integer classComments = 0;
Integer triggerLines = 0;
Integer triggerComments = 0;
List<String> lines = new List<String>(); 
String line; 
for (ApexClass a : 
  [SELECT Body FROM ApexClass WHERE NamespacePrefix = null]) { 
  lines = a.Body.split('\n'); 
  classLines += lines.size();
  for (Integer i = 0; i < lines.size(); i++) {
    line = lines[i].replaceAll('\t', '').trim();
    if (line.startsWith('//')) classComments++;
  }    
}
for (ApexTrigger a : 
  [SELECT Body FROM ApexTrigger WHERE NamespacePrefix = null]) {
  lines = a.Body.split('\n');
  triggerLines += lines.size();
  for (Integer i = 0; i < lines.size(); i++) {
    line = lines[i].replaceAll('\t', '').trim();
    if (line.startsWith('//')) triggerComments++;
  }    
}
system.debug('Percent Comments: ' + 
  (Integer)((
    (Decimal)(classComments + triggerComments) / 
    (Decimal)(classLines + triggerLines)) 
    * 100) + '%');